Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D01: Photonuclear and Hadronic Physics at Low Energies |
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Chair: Mohammad Ahmed, North Carolina Central University Room: Holiday Inn Knoxville Downtown Summit |
Thursday, November 8, 2018 4:30PM - 5:00PM |
D01.00001: Low Energy Photodisintegration of 3He at TUNL Invited Speaker: Forrest QL Friesen The first exclusive low enegy cross-section measurements for three-body photodisintegration of 3He have been performed using the nearly monoenergetic photon beam at the High Intensity γ-ray Source (HIγS) facility at Triangle Universities Nuclear Laboratory. These data test ab-initio calculations using a combination of absolute and relative measurements across a broad range of three-nucleon phase space.
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Thursday, November 8, 2018 5:00PM - 5:30PM |
D01.00002: Fission product yield measurements at HIγS Invited Speaker: Sean W Finch Fission is complex nuclear process, with one of the key observables being the fission product yields (FPYs). Photofission offers a unique probe to help test theoretical models. A TUNL-LLNL-LANL collaboration is performing precision measurements of FPYs using monoenergetic γ-ray beams produced at the high intensity γ-ray source, HIγS. Fission chambers are used to measure the γ-ray flux and high-purity germanium detectors quantify the decaying fission products. The fission products are identified by their characteristic γ-rays and tracked across several half-lifes. Our current measurements span fission products with half-lifes ranging from minutes to 60 days. Future work includes the addition of a rapid transit system, which will extend our measurements to include fission products with half-lifes <10 s. Measurements of even shorter-lived fission products were made using the pulsing of the HIγS beam. This was done for the isomeric fission products 134mTe (T1/2 = 162 ns) and 136mXe (T1/2 = 2.95 μs). The ratio of the yields 134mTe/136mXe was found to be strongly dependent of the identity of the fissioning nuclei, indicating that these fission isomers may be used for active interrogation to detect and identify special nuclear materials. Additionally, measurements of the isomeric to ground state yields can provide information on the angular momentum of the fragments. |
Thursday, November 8, 2018 5:30PM - 6:00PM |
D01.00003: Measuring the Electromagnetic Properties of the Nucleon at HIγS Invited Speaker: Mark Sikora The electromagnetic properties of the nucleon arise from its composite nature. External electric and magnetic fields induce dipole moments described by the scalar polarizabilities (αN and βN), while the response of the nucleon spin is described by four spin polarizabilities. Consequently, studying these observables offers a window into the interaction among the constituent charges and currents in the nucleon, described theoretically by QCD. In particular, high precision measurements of the scalar and spin polarizabilities provide a means for studying the low-energy, non-perturbative regime of QCD. Such measurements are needed to constrain emerging calculations from lattice QCD and Chiral Effective Field Theories and are critical inputs to descriptions of the proton-neutron mass difference. To this end, a program of Compton scattering experiments on light nuclei is underway at the High Intensity Gamma Source (HIγS) at Duke University, with the aim of providing the world's most precise data to extract the polarizabilities. We report preliminary measurements fom Compton scattering experiments on 4He, 2H, and 1H and discuss the sensitivity of these data to the polarizabilities. |
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